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Subject: Build libv4lconvert helper support only when fork() is available
Author:  Thomas Petazzoni <thomas.petazz...@free-electrons.com>
Date:    Wed Jul 26 14:51:24 2017 +0200

Signed-off-by: Thomas Petazzoni <thomas.petazz...@free-electrons.com>
Signed-off-by: Gregor Jasny <gja...@googlemail.com>

 configure.ac                      | 3 +++
 lib/libv4lconvert/Makefile.am     | 7 ++++++-
 lib/libv4lconvert/libv4lconvert.c | 6 ++++++
 3 files changed, 15 insertions(+), 1 deletion(-)

---

http://git.linuxtv.org/cgit.cgi/v4l-utils.git/commit/?id=ed6eeee5f7dbc5b1b5b9263ae9281665d3fbe105
diff --git a/configure.ac b/configure.ac
index ae8f2e201a5b..72c9421c0d08 100644
--- a/configure.ac
+++ b/configure.ac
@@ -299,6 +299,9 @@ argp_saved_libs=$LIBS
   AC_SUBST([ARGP_LIBS])
 LIBS=$argp_saved_libs
 
+AC_CHECK_FUNCS([fork], AC_DEFINE([HAVE_LIBV4LCONVERT_HELPERS],[1],[whether to 
use libv4lconvert helpers]))
+AM_CONDITIONAL([HAVE_LIBV4LCONVERT_HELPERS], [test x$ac_cv_func_fork = xyes])
+
 AC_CHECK_HEADER([linux/i2c-dev.h], [linux_i2c_dev=yes], [linux_i2c_dev=no])
 AM_CONDITIONAL([HAVE_LINUX_I2C_DEV], [test x$linux_i2c_dev = xyes])
 
diff --git a/lib/libv4lconvert/Makefile.am b/lib/libv4lconvert/Makefile.am
index 4f332fa164b4..f266f3e75d78 100644
--- a/lib/libv4lconvert/Makefile.am
+++ b/lib/libv4lconvert/Makefile.am
@@ -1,6 +1,8 @@
 if WITH_DYN_LIBV4L
 lib_LTLIBRARIES = libv4lconvert.la
+if HAVE_LIBV4LCONVERT_HELPERS
 libv4lconvertpriv_PROGRAMS = ov511-decomp ov518-decomp
+endif
 include_HEADERS = ../include/libv4lconvert.h
 pkgconfig_DATA = libv4lconvert.pc
 LIBV4LCONVERT_VERSION = -version-info 0
@@ -16,11 +18,14 @@ libv4lconvert_la_SOURCES = \
   control/libv4lcontrol.c control/libv4lcontrol.h control/libv4lcontrol-priv.h 
\
   processing/libv4lprocessing.c processing/whitebalance.c 
processing/autogain.c \
   processing/gamma.c processing/libv4lprocessing.h 
processing/libv4lprocessing-priv.h \
-  helper.c helper-funcs.h libv4lconvert-priv.h libv4lsyscall-priv.h \
+  helper-funcs.h libv4lconvert-priv.h libv4lsyscall-priv.h \
   tinyjpeg.h tinyjpeg-internal.h
 if HAVE_JPEG
 libv4lconvert_la_SOURCES += jpeg_memsrcdest.c jpeg_memsrcdest.h
 endif
+if HAVE_LIBV4LCONVERT_HELPERS
+libv4lconvert_la_SOURCES += helper.c
+endif
 libv4lconvert_la_CPPFLAGS = $(CFLAG_VISIBILITY) $(ENFORCE_LIBV4L_STATIC)
 libv4lconvert_la_LDFLAGS = $(LIBV4LCONVERT_VERSION) -lrt -lm $(JPEG_LIBS) 
$(ENFORCE_LIBV4L_STATIC)
 
diff --git a/lib/libv4lconvert/libv4lconvert.c 
b/lib/libv4lconvert/libv4lconvert.c
index d60774e27e58..1a5ccec25285 100644
--- a/lib/libv4lconvert/libv4lconvert.c
+++ b/lib/libv4lconvert/libv4lconvert.c
@@ -122,8 +122,10 @@ static const struct v4lconvert_pixfmt 
supported_src_pixfmts[] = {
        { V4L2_PIX_FMT_JPEG,             0,      7,      7,     0 },
        { V4L2_PIX_FMT_PJPG,             0,      7,      7,     1 },
        { V4L2_PIX_FMT_JPGL,             0,      7,      7,     1 },
+#ifdef HAVE_LIBV4LCONVERT_HELPERS
        { V4L2_PIX_FMT_OV511,            0,      7,      7,     1 },
        { V4L2_PIX_FMT_OV518,            0,      7,      7,     1 },
+#endif
        /* uncompressed bayer */
        { V4L2_PIX_FMT_SBGGR8,           8,      8,      8,     0 },
        { V4L2_PIX_FMT_SGBRG8,           8,      8,      8,     0 },
@@ -278,7 +280,9 @@ void v4lconvert_destroy(struct v4lconvert_data *data)
        if (data->cinfo_initialized)
                jpeg_destroy_decompress(&data->cinfo);
 #endif // HAVE_JPEG
+#ifdef HAVE_LIBV4LCONVERT_HELPERS
        v4lconvert_helper_cleanup(data);
+#endif
        free(data->convert1_buf);
        free(data->convert2_buf);
        free(data->rotate90_buf);
@@ -833,6 +837,7 @@ static int v4lconvert_convert_pixfmt(struct v4lconvert_data 
*data,
                                return -1;
                        }
                        break;
+#ifdef HAVE_LIBV4LCONVERT_HELPERS
                case V4L2_PIX_FMT_OV511:
                        if (v4lconvert_helper_decompress(data, 
LIBV4LCONVERT_PRIV_DIR "/ov511-decomp",
                                                src, src_size, d, d_size, 
width, height, yvu)) {
@@ -849,6 +854,7 @@ static int v4lconvert_convert_pixfmt(struct v4lconvert_data 
*data,
                                return -1;
                        }
                        break;
+#endif
                }
 
                switch (dest_pix_fmt) {

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